/Engine/Plugins/Runtime/AudioModulation/Source/AudioModulation/Public/SoundControlBusMix.h
Solos this mix, deactivating all others and activating this (if its not already active), while testing in-editor in all active worlds
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(Category=Mix, Meta=(CallInEditor="true")) void SoloMix()